Every medical method has its advocates. The preference
of mortal mind for a certain method creates a demand
for that method, and the body then seems to require
such treatment. You can even educate a
healthy horse so far in physiology that he will take cold
without his blanket, whereas the wild animal, left to his
instincts, sniffs the wind with delight. The epizootic is
a humanly evolved ailment, which a wild horse might
never have.